/**
 *
 */
package yl.hs.bmipfull.security;

import org.springframework.util.DigestUtils;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @category Md5加密工具
 *
 * @author 谢景广
 *
 */
public class MD5 {

    public static String getMD5(String source) {
        try {
           return DigestUtils.md5DigestAsHex(source.getBytes("utf-8")).toUpperCase();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return "";
    }
    public static String backMD5(String source) {
        try {
            return DigestUtils.md5DigestAsHex(source.getBytes("utf-8")).toUpperCase();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return "";
    }
    /**
     * 使用md5的算法进行加密
     */
    public static String md5(String plainText) {
        byte[] secretBytes = null;
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(
                    plainText.getBytes());
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("没有md5这个算法！");
        }
        String md5code = new BigInteger(1, secretBytes).toString(16);// 16进制数字
        // 如果生成数字未满32位，需要前面补0
        for (int i = 0; i < 32 - md5code.length(); i++) {
            md5code = "0" + md5code;
        }
        return md5code;
    }

    /**
     * 可逆的的加密解密方法；两次是解密，一次是加密
     * @param inStr
     * @return
     */
    public static String convertMD5(String inStr){

        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++){
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;

    }
}
